?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / video / geode / video_gx.c
blobfebf09c63492fa6bdaba484c9bc603d35b1a4140
1 /*
2 * Geode GX video processor device.
3 *
4 * Copyright (C) 2006 Arcom Control Systems Ltd.
5 *
6 * Portions from AMD's original 2.4 driver:
7 * Copyright (C) 2004 Advanced Micro Devices, Inc.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14 #include <linux/fb.h>
15 #include <linux/delay.h>
16 #include <asm/io.h>
17 #include <asm/delay.h>
18 #include <asm/msr.h>
19
20 #include "geodefb.h"
21 #include "video_gx.h"
22
23
24 /*
25 * Tables of register settings for various DOTCLKs.
26 */
27 struct gx_pll_entry {
28 long pixclock; /* ps */
29 u32 sys_rstpll_bits;
30 u32 dotpll_value;
31 };
32
33 #define POSTDIV3 ((u32)MSR_GLCP_SYS_RSTPLL_DOTPOSTDIV3)
34 #define PREMULT2 ((u32)MSR_GLCP_SYS_RSTPLL_DOTPREMULT2)
35 #define PREDIV2 ((u32)MSR_GLCP_SYS_RSTPLL_DOTPOSTDIV3)
36
37 static const struct gx_pll_entry gx_pll_table_48MHz[] = {
38 { 40123, POSTDIV3, 0x00000BF2 }, /* 24.9230 */
39 { 39721, 0, 0x00000037 }, /* 25.1750 */
40 { 35308, POSTDIV3|PREMULT2, 0x00000B1A }, /* 28.3220 */
41 { 31746, POSTDIV3, 0x000002D2 }, /* 31.5000 */
42 { 27777, POSTDIV3|PREMULT2, 0x00000FE2 }, /* 36.0000 */
43 { 26666, POSTDIV3, 0x0000057A }, /* 37.5000 */
44 { 25000, POSTDIV3, 0x0000030A }, /* 40.0000 */
45 { 22271, 0, 0x00000063 }, /* 44.9000 */
46 { 20202, 0, 0x0000054B }, /* 49.5000 */
47 { 20000, 0, 0x0000026E }, /* 50.0000 */
48 { 19860, PREMULT2, 0x00000037 }, /* 50.3500 */
49 { 18518, POSTDIV3|PREMULT2, 0x00000B0D }, /* 54.0000 */
50 { 17777, 0, 0x00000577 }, /* 56.2500 */
51 { 17733, 0, 0x000007F7 }, /* 56.3916 */
52 { 17653, 0, 0x0000057B }, /* 56.6444 */
53 { 16949, PREMULT2, 0x00000707 }, /* 59.0000 */
54 { 15873, POSTDIV3|PREMULT2, 0x00000B39 }, /* 63.0000 */
55 { 15384, POSTDIV3|PREMULT2, 0x00000B45 }, /* 65.0000 */
56 { 14814, POSTDIV3|PREMULT2, 0x00000FC1 }, /* 67.5000 */
57 { 14124, POSTDIV3, 0x00000561 }, /* 70.8000 */
58 { 13888, POSTDIV3, 0x000007E1 }, /* 72.0000 */
59 { 13426, PREMULT2, 0x00000F4A }, /* 74.4810 */
60 { 13333, 0, 0x00000052 }, /* 75.0000 */
61 { 12698, 0, 0x00000056 }, /* 78.7500 */
62 { 12500, POSTDIV3|PREMULT2, 0x00000709 }, /* 80.0000 */
63 { 11135, PREMULT2, 0x00000262 }, /* 89.8000 */
64 { 10582, 0, 0x000002D2 }, /* 94.5000 */
65 { 10101, PREMULT2, 0x00000B4A }, /* 99.0000 */
66 { 10000, PREMULT2, 0x00000036 }, /* 100.0000 */
67 { 9259, 0, 0x000007E2 }, /* 108.0000 */
68 { 8888, 0, 0x000007F6 }, /* 112.5000 */
69 { 7692, POSTDIV3|PREMULT2, 0x00000FB0 }, /* 130.0000 */
70 { 7407, POSTDIV3|PREMULT2, 0x00000B50 }, /* 135.0000 */
71 { 6349, 0, 0x00000055 }, /* 157.5000 */
72 { 6172, 0, 0x000009C1 }, /* 162.0000 */
73 { 5787, PREMULT2, 0x0000002D }, /* 172.798 */
74 { 5698, 0, 0x000002C1 }, /* 175.5000 */
75 { 5291, 0, 0x000002D1 }, /* 189.0000 */
76 { 4938, 0, 0x00000551 }, /* 202.5000 */
77 { 4357, 0, 0x0000057D }, /* 229.5000 */
78 };
79
80 static const struct gx_pll_entry gx_pll_table_14MHz[] = {
81 { 39721, 0, 0x00000037 }, /* 25.1750 */
82 { 35308, 0, 0x00000B7B }, /* 28.3220 */
83 { 31746, 0, 0x000004D3 }, /* 31.5000 */
84 { 27777, 0, 0x00000BE3 }, /* 36.0000 */
85 { 26666, 0, 0x0000074F }, /* 37.5000 */
86 { 25000, 0, 0x0000050B }, /* 40.0000 */
87 { 22271, 0, 0x00000063 }, /* 44.9000 */
88 { 20202, 0, 0x0000054B }, /* 49.5000 */
89 { 20000, 0, 0x0000026E }, /* 50.0000 */
90 { 19860, 0, 0x000007C3 }, /* 50.3500 */
91 { 18518, 0, 0x000007E3 }, /* 54.0000 */
92 { 17777, 0, 0x00000577 }, /* 56.2500 */
93 { 17733, 0, 0x000002FB }, /* 56.3916 */
94 { 17653, 0, 0x0000057B }, /* 56.6444 */
95 { 16949, 0, 0x0000058B }, /* 59.0000 */
96 { 15873, 0, 0x0000095E }, /* 63.0000 */
97 { 15384, 0, 0x0000096A }, /* 65.0000 */
98 { 14814, 0, 0x00000BC2 }, /* 67.5000 */
99 { 14124, 0, 0x0000098A }, /* 70.8000 */
100 { 13888, 0, 0x00000BE2 }, /* 72.0000 */
101 { 13333, 0, 0x00000052 }, /* 75.0000 */
102 { 12698, 0, 0x00000056 }, /* 78.7500 */
103 { 12500, 0, 0x0000050A }, /* 80.0000 */
104 { 11135, 0, 0x0000078E }, /* 89.8000 */
105 { 10582, 0, 0x000002D2 }, /* 94.5000 */
106 { 10101, 0, 0x000011F6 }, /* 99.0000 */
107 { 10000, 0, 0x0000054E }, /* 100.0000 */
108 { 9259, 0, 0x000007E2 }, /* 108.0000 */
109 { 8888, 0, 0x000002FA }, /* 112.5000 */
110 { 7692, 0, 0x00000BB1 }, /* 130.0000 */
111 { 7407, 0, 0x00000975 }, /* 135.0000 */
112 { 6349, 0, 0x00000055 }, /* 157.5000 */
113 { 6172, 0, 0x000009C1 }, /* 162.0000 */
114 { 5698, 0, 0x000002C1 }, /* 175.5000 */
115 { 5291, 0, 0x00000539 }, /* 189.0000 */
116 { 4938, 0, 0x00000551 }, /* 202.5000 */
117 { 4357, 0, 0x0000057D }, /* 229.5000 */
118 };
119
120 static void gx_set_dclk_frequency(struct fb_info *info)
121 {
122 const struct gx_pll_entry *pll_table;
123 int pll_table_len;
124 int i, best_i;
125 long min, diff;
126 u64 dotpll, sys_rstpll;
127 int timeout = 1000;
128
129 /* Rev. 1 Geode GXs use a 14 MHz reference clock instead of 48 MHz. */
130 if (cpu_data(0).x86_mask == 1) {
131 pll_table = gx_pll_table_14MHz;
132 pll_table_len = ARRAY_SIZE(gx_pll_table_14MHz);
133 } else {
134 pll_table = gx_pll_table_48MHz;
135 pll_table_len = ARRAY_SIZE(gx_pll_table_48MHz);
136 }
137
138 /* Search the table for the closest pixclock. */
139 best_i = 0;
140 min = abs(pll_table[0].pixclock - info->var.pixclock);
141 for (i = 1; i < pll_table_len; i++) {
142 diff = abs(pll_table[i].pixclock - info->var.pixclock);
143 if (diff < min) {
144 min = diff;
145 best_i = i;
146 }
147 }
148
149 rdmsrl(MSR_GLCP_SYS_RSTPLL, sys_rstpll);
150 rdmsrl(MSR_GLCP_DOTPLL, dotpll);
151
152 /* Program new M, N and P. */
153 dotpll &= 0x00000000ffffffffull;
154 dotpll |= (u64)pll_table[best_i].dotpll_value << 32;
155 dotpll |= MSR_GLCP_DOTPLL_DOTRESET;
156 dotpll &= ~MSR_GLCP_DOTPLL_BYPASS;
157
158 wrmsrl(MSR_GLCP_DOTPLL, dotpll);
159
160 /* Program dividers. */
161 sys_rstpll &= ~( MSR_GLCP_SYS_RSTPLL_DOTPREDIV2
162 | MSR_GLCP_SYS_RSTPLL_DOTPREMULT2
163 | MSR_GLCP_SYS_RSTPLL_DOTPOSTDIV3 );
164 sys_rstpll |= pll_table[best_i].sys_rstpll_bits;
165
166 wrmsrl(MSR_GLCP_SYS_RSTPLL, sys_rstpll);
167
168 /* Clear reset bit to start PLL. */
169 dotpll &= ~(MSR_GLCP_DOTPLL_DOTRESET);
170 wrmsrl(MSR_GLCP_DOTPLL, dotpll);
171
172 /* Wait for LOCK bit. */
173 do {
174 rdmsrl(MSR_GLCP_DOTPLL, dotpll);
175 } while (timeout-- && !(dotpll & MSR_GLCP_DOTPLL_LOCK));
176 }
177
178 static void
179 gx_configure_tft(struct fb_info *info)
180 {
181 struct geodefb_par *par = info->par;
182 unsigned long val;
183 unsigned long fp;
184
185 /* Set up the DF pad select MSR */
186
187 rdmsrl(GX_VP_MSR_PAD_SELECT, val);
188 val &= ~GX_VP_PAD_SELECT_MASK;
189 val |= GX_VP_PAD_SELECT_TFT;
190 wrmsrl(GX_VP_MSR_PAD_SELECT, val);
191
192 /* Turn off the panel */
193
194 fp = readl(par->vid_regs + GX_FP_PM);
195 fp &= ~GX_FP_PM_P;
196 writel(fp, par->vid_regs + GX_FP_PM);
197
198 /* Set timing 1 */
199
200 fp = readl(par->vid_regs + GX_FP_PT1);
201 fp &= GX_FP_PT1_VSIZE_MASK;
202 fp |= info->var.yres << GX_FP_PT1_VSIZE_SHIFT;
203 writel(fp, par->vid_regs + GX_FP_PT1);
204
205 /* Timing 2 */
206 /* Set bits that are always on for TFT */
207
208 fp = 0x0F100000;
209
210 /* Add sync polarity */
211
212 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
213 fp |= GX_FP_PT2_VSP;
214
215 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
216 fp |= GX_FP_PT2_HSP;
217
218 writel(fp, par->vid_regs + GX_FP_PT2);
219
220 /* Set the dither control */
221 writel(0x70, par->vid_regs + GX_FP_DFC);
222
223 /* Enable the FP data and power (in case the BIOS didn't) */
224
225 fp = readl(par->vid_regs + GX_DCFG);
226 fp |= GX_DCFG_FP_PWR_EN | GX_DCFG_FP_DATA_EN;
227 writel(fp, par->vid_regs + GX_DCFG);
228
229 /* Unblank the panel */
230
231 fp = readl(par->vid_regs + GX_FP_PM);
232 fp |= GX_FP_PM_P;
233 writel(fp, par->vid_regs + GX_FP_PM);
234 }
235
236 static void gx_configure_display(struct fb_info *info)
237 {
238 struct geodefb_par *par = info->par;
239 u32 dcfg, misc;
240
241 /* Set up the MISC register */
242
243 misc = readl(par->vid_regs + GX_MISC);
244
245 /* Power up the DAC */
246 misc &= ~(GX_MISC_A_PWRDN | GX_MISC_DAC_PWRDN);
247
248 /* Disable gamma correction */
249 misc |= GX_MISC_GAM_EN;
250
251 writel(misc, par->vid_regs + GX_MISC);
252
253 /* Write the display configuration */
254 dcfg = readl(par->vid_regs + GX_DCFG);
255
256 /* Disable hsync and vsync */
257 dcfg &= ~(GX_DCFG_VSYNC_EN | GX_DCFG_HSYNC_EN);
258 writel(dcfg, par->vid_regs + GX_DCFG);
259
260 /* Clear bits from existing mode. */
261 dcfg &= ~(GX_DCFG_CRT_SYNC_SKW_MASK
262 | GX_DCFG_CRT_HSYNC_POL | GX_DCFG_CRT_VSYNC_POL
263 | GX_DCFG_VSYNC_EN | GX_DCFG_HSYNC_EN);
264
265 /* Set default sync skew. */
266 dcfg |= GX_DCFG_CRT_SYNC_SKW_DFLT;
267
268 /* Enable hsync and vsync. */
269 dcfg |= GX_DCFG_HSYNC_EN | GX_DCFG_VSYNC_EN;
270
271 /* Sync polarities. */
272 if (info->var.sync & FB_SYNC_HOR_HIGH_ACT)
273 dcfg |= GX_DCFG_CRT_HSYNC_POL;
274 if (info->var.sync & FB_SYNC_VERT_HIGH_ACT)
275 dcfg |= GX_DCFG_CRT_VSYNC_POL;
276
277 /* Enable the display logic */
278 /* Set up the DACS to blank normally */
279
280 dcfg |= GX_DCFG_CRT_EN | GX_DCFG_DAC_BL_EN;
281
282 /* Enable the external DAC VREF? */
283
284 writel(dcfg, par->vid_regs + GX_DCFG);
285
286 /* Set up the flat panel (if it is enabled) */
287
288 if (par->enable_crt == 0)
289 gx_configure_tft(info);
290 }
291
292 static int gx_blank_display(struct fb_info *info, int blank_mode)
293 {
294 struct geodefb_par *par = info->par;
295 u32 dcfg, fp_pm;
296 int blank, hsync, vsync;
297
298 /* CRT power saving modes. */
299 switch (blank_mode) {
300 case FB_BLANK_UNBLANK:
301 blank = 0; hsync = 1; vsync = 1;
302 break;
303 case FB_BLANK_NORMAL:
304 blank = 1; hsync = 1; vsync = 1;
305 break;
306 case FB_BLANK_VSYNC_SUSPEND:
307 blank = 1; hsync = 1; vsync = 0;
308 break;
309 case FB_BLANK_HSYNC_SUSPEND:
310 blank = 1; hsync = 0; vsync = 1;
311 break;
312 case FB_BLANK_POWERDOWN:
313 blank = 1; hsync = 0; vsync = 0;
314 break;
315 default:
316 return -EINVAL;
317 }
318 dcfg = readl(par->vid_regs + GX_DCFG);
319 dcfg &= ~(GX_DCFG_DAC_BL_EN
320 | GX_DCFG_HSYNC_EN | GX_DCFG_VSYNC_EN);
321 if (!blank)
322 dcfg |= GX_DCFG_DAC_BL_EN;
323 if (hsync)
324 dcfg |= GX_DCFG_HSYNC_EN;
325 if (vsync)
326 dcfg |= GX_DCFG_VSYNC_EN;
327 writel(dcfg, par->vid_regs + GX_DCFG);
328
329 /* Power on/off flat panel. */
330
331 if (par->enable_crt == 0) {
332 fp_pm = readl(par->vid_regs + GX_FP_PM);
333 if (blank_mode == FB_BLANK_POWERDOWN)
334 fp_pm &= ~GX_FP_PM_P;
335 else
336 fp_pm |= GX_FP_PM_P;
337 writel(fp_pm, par->vid_regs + GX_FP_PM);
338 }
339
340 return 0;
341 }
342
343 struct geode_vid_ops gx_vid_ops = {
344 .set_dclk = gx_set_dclk_frequency,
345 .configure_display = gx_configure_display,
346 .blank_display = gx_blank_display,
347 };
mah project overlay